Basically, no; that is why I questionned the possibility of arcking (this is a 3 coil system, isn't it..so one failed coil will leave you off with only 4 cylinders...I do not know if a rocker can be dislodged randomly....a remote possibility, but if and when one cylinder works on only one valve, it is difficult to appreciate if you are lacking 1,2 or 3 cylinders: harsh feeling is hard to quantify...